Texas Instruments SN54ALS640B Octal Bus Transceivers With 3-State Outputs 5962-8872701SA

The SN54ALS640B is an octal bus transceiver designed for asynchronous two-way communication between data buses. It features inverting logic and operates with 3-state outputs, allowing data transmission from the A bus to the B bus or vice versa, controlled by the direction-control (DIR) input. The output-enable (OE) input can disable the device, effectively isolating the buses. This device is characterized for operation over a military temperature range of -55¬8C to 125¬8C, making it suitable for harsh environments. It supports a supply voltage range of 4.5V to 5.5V and has a maximum low-level output current (IOL) of 12mA, with a higher option of 48mA available in the -1 version, which is not applicable to the SN54ALS640B. The transceiver is available in various package options, including plastic small-outline and ceramic chip carriers. Engineers considering this product should note its robust temperature specifications and versatility in bus communication applications.